Material Flags

Material $flags and $flags2 parameters control how the material is rendered.

Material $flags and $flags2 parameters control how the material is rendered. $flag can be changed in real-time to allow changes in rendering, but $flags2 is read-only and assists the engine or other code in using the material correctly. Enumerations found in https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/public/materialsystem/imaterial.h

The flags can also be set via the .vmt Example:

#Sets the MATERIAL_VAR_VERTEXCOLOR and MATERIAL_VAR_VERTEXALPHA flag
UnlitGeneric
{
$basetexture brick/brickwall003a
$vertexcolor 1
$vertexalpha 1
}

$flags

$flags can contain the following flags:

Flag	Value	Comment
MATERIAL_VAR_DEBUG	1
MATERIAL_VAR_NO_DEBUG_OVERRIDE	2
MATERIAL_VAR_NO_DRAW	4
MATERIAL_VAR_USE_IN_FILLRATE_MODE	8
MATERIAL_VAR_VERTEXCOLOR	16	$vertexalpha
MATERIAL_VAR_VERTEXALPHA	32	$vertexalpha
MATERIAL_VAR_SELFILLUM	64	$selfillum
MATERIAL_VAR_ADDITIVE	128
MATERIAL_VAR_ALPHATEST	256	$alphatest
MATERIAL_VAR_MULTIPASS	512
MATERIAL_VAR_ZNEARER	1024
MATERIAL_VAR_MODEL	2048	$model
MATERIAL_VAR_FLAT	4096
MATERIAL_VAR_NOCULL	8192	$nocull
MATERIAL_VAR_NOFOG	16384	$nofog
MATERIAL_VAR_IGNOREZ	32768	$ignorez
MATERIAL_VAR_DECAL	65536
MATERIAL_VAR_ENVMAPSPHERE	131072
MATERIAL_VAR_NOALPHAMOD	262144
MATERIAL_VAR_ENVMAPCAMERASPACE	524288
MATERIAL_VAR_BASEALPHAENVMAPMASK	1048576
MATERIAL_VAR_TRANSLUCENT	2097152	$translucent
MATERIAL_VAR_NORMALMAPALPHAENVMAPMASK	4194304
MATERIAL_VAR_NEEDS_SOFTWARE_SKINNING	8388608
MATERIAL_VAR_OPAQUETEXTURE	16777216
MATERIAL_VAR_ENVMAPMODE	33554432
MATERIAL_VAR_SUPPRESS_DECALS	67108864
MATERIAL_VAR_HALFLAMBERT	134217728	Half Lambert
MATERIAL_VAR_WIREFRAME	268435456
MATERIAL_VAR_ALLOWALPHATOCOVERAGE	536870912
MATERIAL_VAR_IGNORE_ALPHA_MODULATION	1073741824

$flags2

$flags2 can contain the following flags:

Flag	Value	Comment
MATERIAL_VAR2_LIGHTING_UNLIT	0
MATERIAL_VAR2_LIGHTING_VERTEX_LIT	1
MATERIAL_VAR2_LIGHTING_LIGHTMAP0	2
MATERIAL_VAR2_LIGHTING_BUMPED_LIGHTMAP	4
MATERIAL_VAR2_LIGHTING_MASK	7	Sum of 3 above
MATERIAL_VAR2_DIFFUSE_BUMPMAPPED_MODEL	8
MATERIAL_VAR2_USES_ENV_CUBEMAP	16
MATERIAL_VAR2_NEEDS_TANGENT_SPACES	32
MATERIAL_VAR2_NEEDS_SOFTWARE_LIGHTING	64
MATERIAL_VAR2_BLEND_WITH_LIGHTMAP_ALPHA	128
MATERIAL_VAR2_NEEDS_BAKED_LIGHTING_SNAPSHOTS	256
MATERIAL_VAR2_USE_FLASHLIGHT	512
MATERIAL_VAR2_USE_FIXED_FUNCTION_BAKED_LIGHTING	1024
MATERIAL_VAR2_NEEDS_FIXED_FUNCTION_FLASHLIGHT	2048
MATERIAL_VAR2_USE_EDITOR	4096
MATERIAL_VAR2_NEEDS_POWER_OF_TWO_FRAME_BUFFER_TEXTURE	8192
MATERIAL_VAR2_NEEDS_FULL_FRAME_BUFFER_TEXTURE	16384
MATERIAL_VAR2_IS_SPRITECARD	32768
MATERIAL_VAR2_USES_VERTEXID	65536
MATERIAL_VAR2_SUPPORTS_HW_SKINNING	131072
MATERIAL_VAR2_SUPPORTS_FLASHLIGHT	262144

Source: https://developer.valvesoftware.com/wiki/Material_Flags